For example, the statement "...virtual currencies that are issued by the authorities are unstable and doomed to failure, and that Bitcoin is superior to them due to its being tied to a lack of time and energy..." is just the current state of affairs when mining requires a lot of time and electric energy. It cannot be argued that this will continue to happen, for example, I do not exclude the emergence of disproportionately more powerful, in terms of performance, miners that will consume much less energy. As a minimum, this assumption destroys the previous one. And if we talk about technologies, then there are no guarantees that the cryptoalgorithms put into the base of Bitcoin are reliable and really crypto-resistant ....
Of course, you are right, nothing can be ruled out in the future, but for now an increase in power is possible only with an increase in energy intensity, although IBM has already introduced a 433 qubit quantum compute and is going to introduce a Condor processor for 1121 qubits next year, and Flamingo for 1386 qubits is also planned for 2024, but for now the use of quantum computers in mining is being considered just as an experiment.